ant·he·li·on 
(ănt-hēlē-ən, ăn-thē-)
(ănt-hēlē-ən, ăn-thē-)n. pl. ant·he·li·a (-lē-ə) or ant·he·li·ons
A luminous, white, diffuse spot occasionally seen in the sky opposite the sun on the parhelic circle.
[Greek anthēlion, from neuter of anthēlios, opposite the sun : anti-, anti- + hēlios, sun; see sāwel- in the Appendix of Indo-European roots.]